A 55 Kg Girl Swings on a Swing, Whose Seat

Multiple Choice

A 55 kg girl swings on a swing, whose seat is attached to the pivot by 2.5 m long rigid rods (considered to be massless in this problem) . As she swings, she rises to a maximum height such that the angle of the rods with respect to the vertical is 32 degrees. What is the maximum torque on the rods due to her weight, as she moves during one cycle of her swinging from the bottom of her swing path to the highest point?

A) 710 N·m
B) 970 N·m
C) 2400 N·m
D) 2000 N·m